Just personally I think a nano or a smaller tank(eg 20gal) is a little more challenging. A little tricky with controlling fluctuations with various parameters.
My little piece of info from what I have read is;
-the fine sand you are using is sufficiently deep and don't go 4" deep
-no reactor - think of using 2 part additive instead
-yes to refugium -hangon, DIY or whatever. Adds to tank volume and will assist or basically become your primary filter. (works for me)
Read lots first before spending
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